it all depends!!!!
is it a 4x4??
the factory 275-60-20 are 33's your offset will depend on if you are going to run a wide tire?
i run 34's with a 2 1/2 level lift,rims are 4.75 backspace and -6 offset,they stick out a inch or so!
the more the negative offset the more they are going to stick out!
here are some of the more popular ones
backspace offset
4.50 -12
4.75 -6
5.00 0